And I corrected it and provided the link from factcheck.org that explained the situation didn't I?
There's a difference between your memory misplacing something and just lying. I had misremembered him going to Harvard to teaching there but it was University of Chicago and corrected myself and even provided a reliable citation in the process.
Ben Carson, however, has flat-out lied and even the organizations he's lied about has said "no such thing happened (or didn't exist)."
Remember him talking about the riot that happened when MLK Jr was shot? They were able to find other students he was in class with at that same time period (as in going to school with) and they didn't remember that happening. They remembered the riots but not people specifically going after white people and his own physics teacher didn't remember him saving anyone.